I have a nice Jacks Open and love it. But if you’re buying a machine based off of how much you can sell it for I would say don’t buy it.
Pinball is a great hobby and when people try to turn it into a business and ask “Pinrescue” prices for machines it takes away from what makes pinball great. Not saying that’s what you’re doing. Sure I’ve had multiples of games and made one great original and sold the others and flipped a game I found on a local Craig’s list to finance buying something I wanted at a show. I respect your skills and want to restore a machine, but just do it because you enjoy it, not because of the profit you’ll potentially make from a hobby.
The machines were meant to be played and you bringing a game back to life is what the hobby is about